Railway truck



A ril 15, 1941. 0. K. KJOLSETH RAILWAY TRUCK Filed Dec. 28, 1939Inventor: Ole K. KJolsech,

b y Hi Attorn ey.

Patented Apr. 15, 1941 RAILWAY TRUCK Ole K. Kjolseth, Erie, Pa.,assignor to General Electric Company; a corporation of New YorkApplication December 28, 1939, Serial No. 311,305

12 Claims.

My invention relates to railway guiding trucks.

An object of my invention is to provide an improved railway guidingtruck having a laterally movable bolster supporting a center bearingwhich is adapted to be actuated by the weight carried thereby to exert acentering force on the bolster.

Another object of my invention is to providean improved railway truckhaving a three-point support for a laterally movable bolster to restraintilting thereof and to restrain lateral movement and to center thebolster relative to the truck frame.

Further objects and advantages of my invention will become apparent andmy invention will be better understood from the following descriptionreferring to the accompanying drawing, and the features of novelty whichcharacterize my invention will be pointed out with particularly in theclaims annexed to and forming part of this specification. 1

In the drawing, Fig. 1 is a side elevational viewof a railway truckembodying my invention, partly broken away to show the relativearrangement of the centering device; Fig. 2 is a plan view of the truckshown. in Fig. 1, partly broken away to illustrate the centering device;Fig. 3 is a sectional view taken along line 33 of Fig. 2; Fig. 4 showsthe centering arrangement illustrated in Fig. 3 with the bolsterdisplaced laterally with respect to the truck frame; and Fig. 5 is anenlarged side view of one of the centering cam blocks.

Referring to the drawing, I have shown my invention in connection with atwo-axle guiding truck having a pair of axles [0 provided with wheels IIand outside journal boxes 12 on which the truck frame is supported. Thistruck frame is provided with side frames 13 connected together at theends thereof by transversely extending end frames I4 and adjacent thecentral part by transversely extending elements or transoms l5. In orderto provide a resilient support 7 for the truck frame on the axles HI,leaf springs l6 are supported intermediate the ends thereof on thejournal boxes I 2 and are connected at each inner end by links H to anequalizer l8 secured to the side frames and at' each outer end to theside frames l3 by links Ila. These links frames also are provided withpedestal jaws 2|, which slidably engage journal boxes l2 and areconnected together at their lower ends by tie bars 22. A laterallymovable bolster 23 is arranged intermediate the two transoms 15 betweenstops 24, which limit its upward movement, and is provided with a centerbearing plate 25 on which the locomotive or car may be supported by acenter pin 26. Longitudinal forces are transmitted between the bolsterand the truck frame through bearing surfaces 21 arranged on each side ofthe bolster and secured to the transoms l5.

Lateral movement of the bolster is restrained by a gravity centeringdevice of the general type shown in my Patent 1,751,336, assigned to theGeneral Electric Company, assignee of this application, although otherlateral restraint devices also may be used. In my present construction,this centering device comprises cam blocks 28 having oppositely inclinedcurved cam surfaces 29, which are arranged between the bolster and thetruck frame and secured to the under side of the bolster and the upperside of the transom, and rollers 30 which engage the inclinedcamsurfaces at three spaced apart places about the center of the bolsteras shown in Fig. 2 and transmit the weight on the bolster to the truckframe, The cam surfaces are more clearly shown in Fig. 5 and comprisesurfaces which slope in opposite directions and are inclined withrespect to the bolster. The curvature of these cam surfaces is such thata predetermined maximum centering force is provided with the rollersengaging the central portion 3| thereof, and the restraining forcegradually decreases with lateral displacement of the bolster and therollers with respect to the truck frame. These cam blocks 28 arearranged in spaced apart pairs on each side of the center bearing 25,and each pair includes an upper and a lower block, as shown in Figs. 3and 4. The rollers 30 also are arranged in pairs on each side of thecenter bearing 25, and on one side of the center bearing 25 two rollers30 are longitudinally spaced apart and rotatably mounted upon asupporting pin 32 to provide two supporting points, while on the otherside of the bearing 25, the two rollers are mounted in closely adjacentrelationship upon a pin 3-3 to provide substantially a single point ofsupport. In this manner, the bolster 23 and the center bearing 25 areprovided with substantially a three-point support upon the truck frameby the rollers 30 and the cam blocks 28 to minimize tilting thereofrelative to the truck frame. In

order to insure symmetrical movement of the rollers 39, the supportingpins 32 and 33 for these rollers are mounted upon a transverselyextending frame, which includes a pair of side elements 34 connectedtogether by a transversely extending element 35 to provide a completelyinterconnected gravity roller centering device. It is desirable that therollers 39 maintain a predetermined relation to the cam elements forpredetermined relative positions of the bolster and the truck frame.This relationship is obtained by connecting the roller frame to thebolster and to the truck frame by a linkage including an upwardlyextending link 36 pivotally secured by a pin 37 to roller frame elements38, which are rigidly secured to the transversely extending roller framemember 35. This upwardly extending link 3% extends through an opening23a formed in the bolster 23 and is pivotally connected at its upper endto a link 39, which is pivotally connected to the upper side of thebolster" 23. The lower end of the link 36 extends through an opening 50formed in a transversely extending plate M secured to the transoms i5,and is pivotally connected to .a link 52, which in turn is pivotallysecured to an ear 43 rigidly mounted upon the plate M. This linkageinsures the movement of the interconnected rollers in direct proportionto the lateral movement of the bolster 23 with respect to the truckframe. Thus, lateral movement of the bolster with respect to the truckframe tends to cause the rollers to travel upwardly on the cam surfaces29 and raise the bolster as shown in Fig. 4:. This necessitates exertingan upward force to raise the weight carried by the center bearing andtends to cause the rollers to move toward the central portion 3! of thecam blocks and return the bolster and center bearing by gravity tocentered position.

While I have illustrated and described a particular embodiment of myinvention, modifications thereof will occur to those skilled in the art.I desire it to be understood, therefore, that my invention is not to belimited to the parl ticular arrangement disclosed, and I intend in theappended claims to cover all modifications which do not depart from thespirit and scope of my invention.

What I claim as new and desire to secure by Letters Patent of the UnitedStates, is:

'1. A railway truck having a truck frame, a laterally movable bolster,spaced apart cam surfaces arranged between said bolster and said truckframe, and means arranged to cooperate with said cam surfaces at threeplaces for providing substantially a three-point support for saidbolster on said truck frame arranged to restrain lateral movement ofsaid bolster with respect to said truck frame.

2. A railway truck having a truck frame, a laterally movable bolster,surfaces inclined with respect to said bolster arranged between saidbolster and said truck frame, and means arranged to cooperate with saidinclined surfaces at three places spaced apart about the center of saidbolster for providing substantially a three point support for saidbolster on said truck frame arranged to restrain lateral movement ofsaid bolster with respect to said truck frame.

3. A railway truck having a truck frame, a laterally movable bolster,surfaces inclined with respect to said bolster arranged between saidbolster and said truck frame, and means including a movable memberengaging said inclined surfaces at three places spaced apart about thecenter of said bolster for providing substantially a three-point supportfor said bolster on said truck frame arranged to restrain lateralmovement of said bolster with respect to said truck frame.

4. A railway truck having a truck frame, a laterally movable bolster, aplurality of spaced apart cam surfaces, a plurality of rollers, andmeans including the arrangement of said plurality of rollers inengagement with said cam surfaces at three spaced apart places forproviding substantially a three-point support for said bolster arrangedto restrain lateral movement of said bolster relative to said truckframe.

5. A railway truck having a truck frame, a bolster, a plurality ofspaced apart cam surfaces arranged between said bolster and said truckframe, a plurality of rollers, and means including the arrangement ofsaid plurality of rollers in engagement with said cam surfaces at threespaced apart places for providing substantially a three-point supportfor said bolster on said truck frame arranged to restrain later-a1movement of said bolster relative to said truck frame.

6. A railway truck having a truck frame, a laterally movable bolster, aplurality of surfaces inclined relative to said bolster, a plurality ofrollers, and means including the arrangement of said plurality ofrollers in engagement with said surfaces at three spaced apart placesfor providing substantially a three-point support for said bolsterarranged to restrain lateral movement of said bolster relative to saidtruck frame.

7. A railway truck having a truck frame, a center bearing, a pluralityof cam surfaces arranged between said center bearing and said truckframe, a plurality of rollers, and means including the arrangement ofsaid plurality of rollers in engagement with said cam surfaces at threespaced apart places for providing substantially a three-point supportfor said center bearing on said truck frame arranged to restrain lateralmovement of said center bearing relative to said truck frame.

8. A railway truck having a truck frame, a laterally movable bolster, aplurality of cam surfaces arranged between said bolster and said truckframe, a plurality of rollers, means in-, cluding the arrangement ofsaid plurality of rollers in engagement with said cam surf-aces at threespaced apart places for providing substantially a three-point supportfor said bolster arranged to restrain lateral movement of said bolsterrelative to said truck frame, and means including a linkage connected tosaid bolster for moving said rollers relative to said cam surfaces onlateral movement of said bolster relative to said truck frame.

9. A railway truck having a truck frame, a laterally movable bolster, aplurality of surfaces inclined relative to said bolster arranged betweensaid bolster and said truck frame, means including a plurality ofinterconnected rollers arranged between said bolster and said truckframe in engagement with said inclined surfaces at three places spacedapart about the center of said bolster for providing substantially athree-point support for said bolster on said truck frame arranged torestrain lateral movement of said bolster relative tosaid truck frame,and means including a linkage connected to said bolster and to saidtruck frame for moving said rollers relative to said surfaces on lateralmovement of said bolster relative to said truck frame.

'10. A railway truck having a truck frame, a laterally movable bolster,surfaces inclined with respect to said bolster arranged between saidbolster and said truck frame, means including a movable member engagingsaid inclined surfaces at three places for providing substantially athree; point support for said bolster on said truck frame arranged torestrain lateral movement of said bolster with respect to said truckframe, and a linkage connected to said truck frame and to said bolsterfor moving said member relative to said inclined surfaces on lateralmovement of said bolster with respect to said truck frameJf .-11. Arailway truck having a truckframe, a l-aterally.movable bolster, curvedcam surfaces arranged between said bolster and said truck frame, meansincluding a movable member engaging said cam surfaces at three placesspaced relative movement therebetween, and a linkage connected to saidtruck frame and to said bolster for moving said member relative to saidcam surface on lateral movement of said bolster with respect to saidtruck frame.

I12. A railway truck having a truck frame, a

laterally movable bolster, a plurality of curved cam surfaces arrangedbetween said bolster and said truck frame, means including a pluralityof interconnected rollers arranged between said bolster and said truckframe in engagement with said cam surfaces at three places for providingsubstantially a three-point support for said bolster on said truck framearranged to provide a predetermined restraining force to lateralmovement of said bolster relative to said truck frame for apredetermined relative movement therebetween and substantially norestraining force for further relative movement, and means including alinkage connected to said bolster and to said truck frame for movingsaid rollers relative to said surfaces on lateral movement of saidbolster relative to said truck frame.

OLE K. KJOLSETH.

